JPH05304483A - Card type high frequency equipment - Google Patents

Abstract

PURPOSE:To provide an exterior type electronic tuner capable of reception by being loaded on a main body only when the reception of the images and the voice of a television is desired in an equipment for which tuner is not always required such as a personal computer. CONSTITUTION:A printed circuit board 6 composed of a tuner circuit part, channel control circuit and demodulation circuit part is built in a card type case 2, and a connector 8 for inputting/outputting signals to the printing circuit board 6 is arranged along the one side of the case 2. An upper cover 4 is attached to frame 3 to constitute the case 2 by engaging pawls. Thus, the obtained card type electronic tuner can be handled similarily to conventional general purpose IC memory cards.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a high frequency device such as an electronic tuner, and more particularly to improvement of the form of such a high frequency device.

[0002]

2. Description of the Related Art Television receivers require a tuner, and as such a tuner, an electronic tuner has been widely used recently. Electronic tuners often include tuner circuitry and channel control circuitry for selectively tuning both UHF and VHF signals.

Such an electronic tuner is built in the main body of the television receiver.

[0004]

At present, as a device having a video display function which is generally used, in addition to the above-mentioned television receiver, for example, a video device such as a personal computer having a display, an information device, etc. is there. As a matter of course, since a tuner is not built in these video equipment or information equipment, it is impossible to receive the television broadcast and output the video and audio.

However, in many cases, these video equipment and information equipment already have sufficient functions to be used as a television receiver as long as they have a tuner. Therefore, if these video equipment or information equipment can be used as a television receiver as necessary, the applications of these equipment can be expanded, and as a result, the commercial value can be increased. it can.

The same applies to other high-frequency equipment such as RF modulators. That is,
For example, when a captured image recorded by a video camera is to be played back on a separate monitor device or is to be displayed in real time, normally, the video camera and the monitor device are connected with an RF modulator interposed. Is being done. Regarding the usage state of such an RF modulator, for example, if the RF modulator having a transmission function is built in the video camera, the connection between the video camera and the monitor device as described above becomes unnecessary. However, if the RF modulator is built in the video camera, the portability of the video camera is deteriorated, which is not preferable. Therefore, it is desired that the RF modulator can be attached to the video camera as needed.

[0007] Therefore, it is an object of the present invention to provide a high frequency device such as an electronic tuner or an RF modulator having a form suitable for mounting on a desired device as needed.

[0008]

In order to solve the above-mentioned technical problems, the present invention provides a card type high frequency device.

This card-type high-frequency device has a card-type case, a circuit board housed in the case, and is electrically connected to the circuit board and arranged along one side of the case. And a connector.

Further, the above-mentioned case includes a frame for positioning the circuit board, and an upper cover arranged in parallel to the circuit board and joined to the frame. The upper cover is made of a metal plate and has a plurality of claws formed on both side edges thereof, and the plurality of claws each have an L-shape facing in the same direction. Also,
The frame is provided with a fitting portion that receives the above-described plurality of claws in a direction orthogonal to the surface formed by the upper cover and engages the movement by moving in a direction parallel to the surface formed by the upper cover.

[0011]

According to such a card type high frequency device, for example, a circuit necessary for a desired high frequency device such as an electronic tuner or an RF modulator, as well as a necessary peripheral circuit which is not provided in a video device or an information device to which the high frequency device is mounted are provided. , Can be stored in a card type case. Input / output of signals can be performed via the connector.

[0012]

As described above, according to the present invention, a high-frequency device having a card type as a whole, such as an IC memory card, is obtained. Such a card type high frequency device is easy to store and carry, and is suitable for handling as an optional accessory for various video devices or information devices. Therefore, it is not necessary to store a function that is not always used in the main body of these devices, such as a function as a television receiver in a video device or an information device. It can be prevented.

In order to mount the card type high frequency equipment according to the present invention on a video equipment or an information equipment, a main body of such equipment is provided with, for example, a slot in which the card type high frequency equipment can be mounted. In connection with this slot, a connector paired with the connector provided in the card type high frequency device may be provided. If such a slot can be shared with other function cards, it becomes easy to give a plurality of optional functions to one device by switching with a switch, for example.

Further, the upper cover is brought into a state of being joined to the frame by engaging a plurality of claws provided therein with a fitting portion formed on the frame, so that the upper cover is attached to the frame. This makes it easy to mount and then assemble the card type high frequency device.

Further, since the upper cover is made of metal, the ground connection of the circuit board can be surely achieved by utilizing the upper cover.

[0016]

Embodiments Embodiments in which the present invention is applied to an electronic tuner will be described below.

FIG. 1 is a perspective view showing the appearance of a card type electronic tuner 1 according to an embodiment of the present invention. Figure 2
FIG. 2 is an enlarged sectional view taken along the line II-II in FIG. 1. Figure 3
FIG. 2 is a block diagram showing an electric circuit provided in the card type electronic tuner 1.

The card type electronic tuner 1 includes a card type case 2. Case 2 is frame 3, frame 3
And an upper cover 4 for closing the upper opening of the frame 3, and a lower cover 5 for closing the lower opening of the frame 3. Such a case 2 is preferably sized substantially the same as a general-purpose IC memory card.

The lower cover 5 described above may be formed integrally with the frame 3 or may be provided by a part of a circuit board described later.

A circuit board is housed in the case 2. The circuit board comprises a printed circuit board 6 in this example. On the printed circuit board 6, for example,
A double-sided wiring type of glass epoxy substrate having a thickness of 0.5 mm is used. Required electronic components 7 and connectors 8 are surface-mounted on the upper surface of the printed circuit board 6. The lower surface of the printed circuit board 6 is provided with required wiring and ground wiring which are electrically connected to the wiring on the upper surface through the through holes. Although not shown, the lower surface of the printed circuit board 6 is covered with an insulating film.

The printed circuit board 6 may be made of a material such as ceramic, or may have a multilayer structure. Further, each outer surface of the lower cover 5 and the upper cover 4 can be appropriately used as a surface for printing or the like.

As described above, the connector 8 surface-mounted on the printed circuit board 6 is of a socket type and is arranged along the short side of the case 2, for example.

As represented by the electronic component 7 shown in FIG. 2, various circuits are formed on the printed circuit board 6. The circuit constructed on this printed circuit board 6 is shown in FIG.

Referring to FIG. 3, the circuit formed on the printed circuit board 6 is roughly divided into a tuner circuit section 9, a channel control circuit section 10 and a demodulation circuit section 11.
Further, the tuner circuit unit 9 includes the VHF circuit unit 12 and the U
The HF circuit unit 13 is provided.

U input from the U / V signal input terminal 14
The HF / VHF signal is distributed by the distributor 15 and input to the corresponding circuit unit 12 or 13. These circuit units 12 and 13 are respectively provided with a bandpass filter 16
And 17, amplifiers 18 and 19, and bandpass filters 20 and 21.

The channel control circuit section 10 includes a channel control circuit 22, and the output of the channel control circuit 22 is input to local oscillation circuits 23 and 24. The local oscillation signal output from one local oscillation circuit 24 is mixed with the high frequency signal output from the bandpass filter 21 of the UHF circuit unit 13 in the mixing circuit 25, and then amplified in the mixing / amplifying circuit 26. It On the other hand,
The local oscillation signal output from the local oscillation circuit 23 is mixed in the mixing / amplification circuit 26 with the high frequency signal output from the bandpass filter 20 of the VHF circuit unit 12.

The intermediate frequency signal output from the mixing / amplifying circuit 26 is input to the amplifier 28 provided in the demodulation circuit section 11 through the bandpass filter 27. The signal amplified by the amplifier 28 is input to the demodulation circuit 30 via the surface acoustic wave filter 29. In the demodulation circuit 30, the video signal is AM-detected and the audio signal is FM-detected to be demodulated into a video signal and an audio signal, which are applied to the video signal output terminal 31 and the audio signal output terminal 32, respectively. From the demodulation circuit 30,
A sync signal is applied to the sync signal output terminal 33.

Further, on the above-mentioned printed circuit board 6, a power supply voltage terminal 34 for supplying a power supply voltage to the entire circuit formed thereon, and the channel control circuit section 10.
A tuning voltage terminal 35 for supplying a tuning voltage to the channel control circuit section 10,
A clock terminal 36 for supplying a data signal and an enable signal, a data terminal 37 and an enable terminal 38, and a ground terminal 39 are formed.

The terminals 14, 31 to 39 thus formed on the printed circuit board 6 are electrically connected to the corresponding contacts provided on the connector 8.

The tuner circuit section 9, the channel control circuit section 10 and the demodulation circuit section 11 described above are respectively shown in FIG.
The first area 40 and the second area 4 sectioned by the broken line in FIG.
It is arranged in the first and third regions 42. First area 40
VHF circuit section 12 included in the tuner circuit section 9
The positional relationship between the UHF circuit unit 13 and the UHF circuit unit 13 can be arbitrarily changed.

Further, in addition to the circuit shown in FIG. 3, a voice multiplexing circuit and other peripheral circuits may be formed on the printed circuit board 6.

As shown in FIG. 2, the upper cover 4 is arranged parallel to the printed circuit board 6. This top cover 4
Is shown alone in FIGS. 4 and 5. Top cover 4
Is made of a metal plate such as stainless steel and has a plurality of claws 43 formed on both side edges thereof. As shown in FIG. 5, the claws 43 have L-shapes facing in the same direction. Nail 43
Is formed, for example, by bending a part of the metal plate that constitutes the upper cover 4.

The frame 3 is shown alone in FIGS. 6-8. 6 is a plan view of the frame 4, FIG. 7 is a bottom view of the same, and FIG. 8 is a line VIII of FIG.
FIG. 8 is a cross-sectional view taken along line VIII.

The frame 3 is an integrally molded product obtained by die casting of aluminum, for example. As described above, when the frame 3 is made of a metal such as aluminum, the frame 3 can be provided with light weight, rigidity and conductivity. For the purpose of obtaining the same performance, the frame 3 may be made of fiber-reinforced plastic that is metal-plated or conductively coated. The purpose of imparting conductivity to the frame 3 is to improve the shielding property, and as described above, the upper cover 4 may be made of a metal plate.
It contributes to the improvement of the shield property. Therefore, the lower cover 5
Also, preferably, it is composed of a metal plate.

A lattice 44 is formed on the frame 3.
The position and thickness of the grid 44 are selected so as not to come into contact with the electronic components 7 and the wiring pattern (excluding the ground wiring) on the printed circuit board 6 or to approach the wiring abnormally. For example, as shown in FIG. 7, notches 45a, 45b, 45c formed at some points of the lattice 44.
Are provided in order to avoid undesired electrical contact of the wiring pattern on the printed circuit board 6. Lattice 4
The space defined by 4 is a space for arranging the electronic components 7 on the printed circuit board 6, and at the same time, is used as a space for performing adjustment work for specific ones of these electronic components 7. The grate 44 also reinforces the frame 3 itself and also provides an abutment surface for preventing the upper cover 4 from denting inward.

The grid 44 forms a shield partition 46, as best shown in FIG. This shield partition 4
Reference numeral 6 denotes a tuner circuit section 9, a channel control circuit section 10 and a demodulation circuit section 11 formed on the printed circuit board 6.
1 extend so as to partition the first region 40, the second region 41, and the third region 42 shown in FIG. 1, which are respectively arranged, and make electrical contact with the earth land on the printed circuit board 6. To be done. As a result, the tuner circuit unit 9, the channel control circuit unit 10, and the demodulation circuit unit 1
Ones are shielded against each other. The notches 45a, 45b, 45c described above are formed in the shield partition wall 46, and the notches 45a, 45b, 45c are formed.
Allows the passage of a wiring pattern extending across the tuner circuit section 9, the channel control circuit section 10, and the demodulation circuit section 11.

The frame 3 serves to position the printed circuit board 6. Therefore, the frame 3 has a plurality of screw holes 4 for screwing the printed circuit board 6.
7a to 47e are provided. These screw holes 47a to 47
The number and position of e can be arbitrarily changed as needed. Screws (not shown) screwed into all or part of these screw holes 47 a to 47 e may be used to fix not only the printed circuit board 6 but also the lower cover 5 to the frame 3. The lower cover 5 may be fixed to the frame 3 by a method such as adhesion or adhesion instead of the above-described screwing.

The frame 3 is further provided with a printed circuit board 6 for ensuring the positioning of the printed circuit board 6.
Are provided with a plurality of protrusions 48a to 48d. These protrusions 48 a to 48 d also have a function of preventing the printed circuit board 6 from bending and being damaged by the load received from the outside of the lower cover 5. The number and position of these protrusions 48a to 48d can be arbitrarily changed as required.

Further, the frame 3 is formed with a positioning recess 49 for positioning the connector 8 described above.

Further, the frame 3 is formed with a plurality of fitting portions 50 for engaging the plurality of claws 43 of the upper cover 4 described above. Further, the frame 3 is formed with a recess 51 for accommodating the upper cover 4 within the thickness range of the frame 3.

The operation for attaching the upper cover 4 to the frame 3 is shown in FIG. First, FIG. 9 (a)
As shown in FIG. 3, the upper cover 4 is aligned with the frame 3 so that the claws 43 are located almost directly above the corresponding fitting portions 50. Then, as shown in FIG.
So that each of the
The claw 43 is inserted into the fitting portion 50 in a direction orthogonal to the surface formed by the upper cover 4. Next, as shown in FIG. 9C, the upper cover 4 is moved in the direction of arrow 52 with respect to the frame 3. As a result, the claw 43 moves in a direction parallel to the surface formed by the upper cover 4, and the engagement with the fitting portion 50 is completed.

From the stage shown in FIG. 9B to the stage shown in FIG. 9C in the above-described operation, the terminal portion of the upper cover 4 is as shown in FIG. 9B. In addition, it rides on the end wall of the recess 51 and is gently bent. However, as shown in FIG.
When the engagement of the claw 43 with the fitting portion 50 is completed, the end portion of the upper cover 4 is also accommodated in the recess 51 due to the elasticity of the upper cover 4. Therefore, the upper cover 4 is restricted from moving in the front-back, left-right, and up-down directions with respect to the frame 3, and a stable mounting state can be realized. In order to further secure such a stable mounting state, the following consideration may be given.

In the case of the card type electronic tuner 1, the above-mentioned stable mounting state has the significance of stabilizing the tuning frequency and preventing the generation of abnormal noise that resonates with the vibration of the speaker or the like.

Referring to FIG. 10, a slope 53 is formed on the upper surface of the tip of claw 43. Further, a slope 54 is formed on the lower surface of the fitting portion 50, as shown in FIG. 11. Due to the presence of the slope 53, the claw 43 engages with the fitting portion 50 even when the distance between the tip end portion of the claw 43 and the upper cover 4 has no clearance with respect to the thickness of the fitting portion 50. It will be possible. Further, due to the existence of the gradient 54 shown in FIG. 11, as described above, even when there is no clearance and the distance between the tip end portion of the claw 43 and the upper cover 4 is narrower than the thickness of the fitting portion 50. , Allow the pawl 43 to be displaced in the direction of arrow 55 to be in the state shown by the broken line. Therefore, the upper cover 4 can be attached to the frame 3 without rattling.

Further, as shown in FIG. 12, a gentle warp may be given to the upper cover 4 in advance. Thereby, when the upper cover 4 is attached to the frame 3, the upper cover 4 can be brought into close contact with the frame 3 at a central portion thereof while applying a constant pressure thereto.

As shown in FIG. 13, a slope 56 opposite to the slope 54 shown in FIG. 11 is formed on the lower surface of the fitting portion 50, and the portion shown in FIG. 13 is viewed from below. As shown in FIG. 14, a slope 57 may be formed near the fitting portion 50. According to this embodiment, the claw 43 has the structure shown in FIG.
When it is displaced in the direction shown by the arrow 58 (corresponding to the arrow 52 in FIG. 9C) shown in FIG. Due to the contact with the gradient 57, the claw 43 is
It is displaced in the direction of the arrow 59 shown in FIG. 13 and deformed to take the form shown by the broken line. As a result, the nail 43
The leading end of the claw 43 goes up the slope 56, and the leading end of the claw 43 bites into the fitting portion 50. Therefore, the upper cover 4
Can be mounted more closely to the frame 3.

Further, as shown in FIG. 15, when attaching the upper cover 4 to the frame 3, screwing may be supplementarily performed. That is, the mounting piece 60 is fixed to the frame 3 by forming the mounting piece 60 at the rear end of the upper cover 4 and screwing the screw 61 passing therethrough into the frame 3.

Further, as shown in FIG. 16, a projection 65 facing the fitting portion 50 may be provided on the claw 43 of the upper cover 4.
Conversely, as shown in FIG. 17, the fitting portion 50 of the frame 3 is
Alternatively, a protrusion 66 facing the claw 43 may be provided. These protrusions 65 or 66 absorb the clearance between the upper cover 4 and the frame 3 and prevent rattling between them. In the process of attaching the upper cover 4 to the frame 3 based on the above-mentioned slide, the protrusions 65 or 66 bite into the other party or are scooped by the other party, thereby realizing the press-fitted state. ..

When a relatively large force is required to slide the upper cover 4 with respect to the frame 3 in order to attach the upper cover 4 to the frame 3 as in the embodiment shown in FIGS. 16 and 17 described above. It is preferable that a bent piece 67 is formed on the rear end of the upper cover 4 as shown in FIG. That is, if a force for sliding the upper cover 4 is applied via the bent piece 67, a larger force can be easily applied to the upper cover 4.

Further, as shown in FIGS. 1 and 6, for the convenience of removing the upper cover 4 from the frame 3,
The frame 3 may be provided with a notch 62 that allows insertion of an appropriate tool between the upper cover 4 and the frame 3. A notch corresponding to the notch 62 may be provided on the upper cover 4 side.

Also, as is often shown in FIG.
It is preferable that the claw 43 be formed with rounded portions 63 and 64 in order to facilitate the receiving operation into the fitting portion 50.

Although not shown in the above-mentioned embodiments relating to the card type electronic tuner 1, the receiving antenna may be externally attached or built in such a card type electronic tuner 1.

Further, the present invention can be applied not only to the electronic tuner but also to other high frequency equipment such as an RF modulator.

[Brief description of drawings]

FIG. 1 is a perspective view showing an external appearance of a card type electronic tuner 1 according to an embodiment of the present invention.

FIG. 2 is an enlarged cross-sectional view taken along the line II-II in FIG.

FIG. 3 is a block diagram showing an electric circuit formed on the printed circuit board 6 shown in FIG.

FIG. 4 is a plan view showing an upper cover 4 alone.

5 is a diagram showing the upper cover 4 from the right side of FIG. 4. FIG.

FIG. 6 is a plan view showing the frame 3 alone.

FIG. 7 is a bottom view showing the frame 3 alone.

8 is a cross-sectional view taken along the line VIII-VIII in FIG.

9 is a partial cross-sectional front view showing a procedure for attaching the upper cover 4 to the frame 3. FIG.

10 is an enlarged cross-sectional view showing a state in which a claw 43 is engaged with a fitting portion 50. FIG.

11 is a cross-sectional view showing the portion shown in FIG. 10 from the right side of FIG.

FIG. 12 is a view for explaining a preferred form given to the upper cover 4.

FIG. 13 is a cross-sectional view for explaining a preferable structure adopted in a portion where the claw 43 engages with the fitting portion 50.

14 is a diagram showing the portion shown in FIG. 13 from below in FIG. 13;

FIG. 15 is a perspective view showing a structure that is supplementarily adopted for fixing the upper cover 4 to the frame 3.

16 is a sectional view corresponding to FIG. 10 for explaining a preferable structure adopted in the claw 43. FIG.

17 is a cross-sectional view corresponding to FIG. 10 for explaining a preferable structure adopted in the fitting portion 50. FIG.

FIG. 18 is a perspective view showing the rear end of the upper cover 4 for explaining the structure advantageously adopted in the embodiment shown in FIG. 16 or FIG.

[Explanation of symbols]

 1 Card Type Electronic Tuner 2 Case 3 Frame 4 Top Cover 6 Printed Circuit Board 7 Electronic Component 8 Connector 9 Tuner Circuit Section 10 Channel Control Circuit Section 11 Demodulation Circuit Section 12 VHF Circuit Section 13 UHF Circuit Section 43 Claw 50 Fitting Section 51 Recess

Claims (1)

[Claims] 1. A card-type case, a circuit board housed in the case, and an electrical connection to the circuit board,
A connector arranged along one side, the case is a frame for positioning the circuit board,
And a top cover arranged parallel to the circuit board and joined to the frame, wherein the top cover is made of a metal plate and has a plurality of claws formed on both side edges thereof. , L-shapes facing in the same direction, the frame receives the plurality of claws in a direction orthogonal to a surface formed by the upper cover, and in a direction parallel to a surface formed by the upper cover. A card type high frequency device in which a fitting portion to be engaged by the movement of is formed.